<template>
    <div class="goods">
        <div class="menu-wrapper" ref="menuWrapper">
            <ul>
                <li class="menu-item" v-for="(item,index) in goods" @click="selectMenu(index,$event)" :key="index" :class="{'current':currentIndex===index}">
                    <span class="text border-1px">
                        <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
                    </span>
                </li>
            </ul>
        </div>
        <div class="foods-wrapper" ref="foodsWrapper">
            <ul>
                <li v-for="(item,index) in goods" class="food-list" ref="foodList" :key="index">
                    <h1 class="title">{{item.name}}</h1>
                    <ul>
                        <li v-for="(food,index) in item.foods" @click="selectFood(food,$event)" class="food-item border-1px" :key="index">
                            <div class="icon"><img width="57" height="57" :src="food.icon"></div>
                            <div class="content">
                                <h2 class="name">{{food.name}}</h2>
                                <p class="desc">{{food.description}}</p>
                                <div class="extra">
                                    <span class="count">月售{{food.sellCount}}份</span>
                                    <span>好评率{{food.rating}}%</span>
                                </div>
                                <div class="price">
                                    <span class="now">¥{{food.price}}</span>
                                    <span class="old" v-show="food.oldPrice">¥{{food.oldPrice}}</span>
                                </div>
                                <div class="cartcontrol-wrapper">
                                    <cartcontrol @add="addFood" :food="food"></cartcontrol>
                                </div>
                            </div>
                        </li>
                    </ul>
                </li>
            </ul>
        </div>
        <food @add="addFood" :food="selectedFood" ref="food"></food>
        <shopcart ref="shopcart" :select-food="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
    </div>
</template>

<script type="text/ecmascript-6">
import BScroll from 'better-scroll';
import shopcart from '../../components/shopcart/shopcart';
import cartcontrol from '../../components/cartcontrol/cartcontrol';
import food from '../../components/food/food';

const ERR_OK = 0;
    export default {
        props: {
            seller: {
                type: Object
            }
        },
        data () {
            return {
                goods: [],
                heightList: [],
                scrollY: 0,
                selectedFood: {}
            };
        },
        computed: {
            currentIndex () {
                for (let i = 0; i < this.heightList.length; i++) {
                    let height1 = this.heightList[i];
                    let height2 = this.heightList[i + 1];
                    if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
                        return i;
                    }
                }
                return 0;
            },
            selectFoods () {
                let foods = [];
                this.goods.forEach((good) => {
                    good.foods.forEach((food) => {
                        if (food.count) {
                            foods.push(food);
                        }
                    });
                });
                return foods;
            }
        },
        created () {
            this.classMap = ['decrease', 'discount', 'guarantee', 'invoice', 'special'];
            this.axios.get('/api/goods').then(res => {
                if (res.data.errno === ERR_OK) {
                    this.goods = res.data.data;
                    this.$nextTick(() => {
                        this._initScroll();
                        this._calculateHeight();
                    });
                }
            });
        },
        methods: {
            selectFood (food, event) {
                if (!event._constructed) {
                    return;
                }
                this.selectedFood = food;
                this.$refs.food.show();
            },
            selectMenu (index, event) {
                if (!event._constructed) {
                    return;
                }
                let foodList = this.$refs.foodList;
                let el = foodList[index];
                this.foodsScroll.scrollToElement(el, 300);
            },
            _initScroll () {
                this.menuScroll = new BScroll(this.$refs.menuWrapper, {
                    click: true
                });
                this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
                    click: true,
                    probeType: 3
                });
                this.foodsScroll.on('scroll', (pos) => {
                    this.scrollY = Math.abs(Math.round(pos.y));
                });
            },
            _calculateHeight () {
                let listHeight = this.$refs.foodList;
                let height = 0;
                this.heightList.push(height);
                for (let i = 0; i < listHeight.length; i++) {
                    let item = listHeight[i].clientHeight;
                    height += item;
                    this.heightList.push(height);
                }
            },
            addFood (target) {
                this._drop(target);
            },
            _drop (target) {
                // 优化体验，异步执行
                this.$nextTick(() => {
                    this.$refs.shopcart.drop(target);
                });
            }
        },
        components: {
            shopcart,
            cartcontrol,
            food
        }
    };
</script>

<style lang="stylus" rel="stylesheet/stylus">
@import '../../common/stylus/mixin';
    .goods
        display :flex
        position :absolute
        top :174px
        bottom :46px
        width :100%
        font-weight :200
        .menu-wrapper
            flex :0 0 80px
            width :80px
            background-color :#f3f5f7
            overflow :hidden
            .current
                font-size :12px
                line-height :14px
                font-size :700
                z-index :10
                margin-top :-1px
                background :#fff
                border-none()
            .menu-item
                display :table
                height :54px
                width :56px
                font-size :12px
                padding :0 12px
                .text
                    display :table-cell
                    vertical-align :middle
                    width :56px
                    font-size :12px
                    font-weight :200
                    line-height :14px
                    border-1px(rgba(7,17,27,0.1))
                .icon
                    display :inline-block
                    vertical-align :top
                    width :12px
                    height :12px
                    background-size :12px 12px
                    background-repeat :no-repeat
                    &.decrease
                        bg-image('decrease_3')
                    &.discount
                        bg-image('discount_3')
                    &.guarantee
                        bg-image('guarantee_3')
                    &.invoice
                        bg-image('invoice_3')
                    &.special
                        bg-image('special_3')
        .foods-wrapper
            flex :1
            overflow :hidden
            .food-list
                .title
                    font-size :12px
                    height :26px
                    color :rgb(147,153,159)
                    line-height :26px
                    border-left :2px solid #d9dde1
                    background :#f3f5f7
                    padding-left :14px
                .food-item
                    display: flex
                    margin: 18px
                    padding-bottom: 18px
                    border-1px(rgba(7, 17, 27, 0.1))
                    &:last-child
                        border-none()
                        margin-bottom: 0
                    .icon
                        flex: 0 0 57px
                        margin-right: 10px
                    .content
                        flex: 1
                        padding-left :10px
                        .name
                            margin: 2px 0 8px 0
                            height: 14px
                            line-height: 14px
                            font-size: 14px
                            color: rgb(7, 17, 27)
                        .desc, .extra
                            line-height: 10px
                            font-size: 10px
                            color: rgb(147, 153, 159)
                        .desc
                            line-height: 12px
                            margin-bottom: 8px
                        .extra
                            .count
                                margin-right :12px
                        .price
                            font-weight :700
                            line-height :24px
                            .now
                                margin-right :8px
                                font-size :14px
                                color :rgb(240,20,20)
                            .old
                                text-decoration :line-through
                                font-size :10px
                                color :rgb(147,153,159)
                        .cartcontrol-wrapper
                            position :absolute
                            right :0
                            bottom :0
</style>
